| 45,7 → 45,7 |
|---|
| pop cx ; previous checksum |
| cmp cx, dx |
| pop edx ecx |
| jne .drop_not_locked |
| jne .drop_no_socket |
| |
| DEBUGF 1,"Checksum ok\n" |
| |
| 52,11 → 52,11 |
|---|
| and [edx + TCP_header.DataOffset], 0xf0 ; Calculate TCP segment header size (throwing away unused reserved bits in TCP header) |
| shr [edx + TCP_header.DataOffset], 2 |
| cmp [edx + TCP_header.DataOffset], sizeof.TCP_header ; Now see if it's at least the size of a standard TCP header |
| jb .drop_not_locked ; If not, drop the packet |
| jb .drop_no_socket ; If not, drop the packet |
| |
| movzx eax, [edx + TCP_header.DataOffset] |
| sub ecx, eax ; substract TCP header size from total segment size |
| jb .drop_not_locked ; If total segment size is less then the advertised header size, drop packet |
| jb .drop_no_socket ; If total segment size is less then the advertised header size, drop packet |
| DEBUGF 1,"we got %u bytes of data\n", ecx |
| |
| ;----------------------------------------------------------------------------------------- |
| 107,7 → 107,7 |
|---|
| .socket_loop: |
| mov ebx, [ebx + SOCKET.NextPtr] |
| or ebx, ebx |
| jz .drop_with_reset_not_locked |
| jz .drop_with_reset_no_socket |
| |
| cmp [ebx + SOCKET.Domain], AF_INET4 |
| jne .socket_loop |
| 1525,15 → 1525,13 |
|---|
| align 4 |
| .drop_with_reset: |
| |
| DEBUGF 1,"Drop with reset\n" |
| |
| pusha |
| lea ecx, [ebx + SOCKET.mutex] |
| call mutex_unlock |
| popa |
| |
| .drop_with_reset_not_locked: |
| |
| DEBUGF 1,"Drop with reset\n" |
| |
| test [edx + TCP_header.Flags], TH_RST |
| jnz .drop |
| |
| 1555,7 → 1553,6 |
|---|
| mov cl, TH_RST |
| call TCP_respond_socket |
| pop ebx |
| |
| jmp .destroy_new_socket |
| |
| |
| 1565,7 → 1562,6 |
|---|
| mov cl, TH_RST + TH_ACK |
| call TCP_respond_socket |
| pop ebx |
| |
| jmp .destroy_new_socket |
| |
| |
| 1572,8 → 1568,6 |
|---|
| |
| |
| |
| |
| |
| ;----- |
| ; Drop |
| |
| 1597,4 → 1591,42 |
|---|
| |
| call kernel_free |
| add esp, 4 |
| ret |
| ret |
| |
| |
| |
| |
| .drop_with_reset_no_socket: |
| |
| DEBUGF 1,"Drop with reset (no socket)\n" |
| |
| test [edx + TCP_header.Flags], TH_RST |
| jnz .drop_no_socket |
| |
| ;;; if its a multicast/broadcast, also drop |
| |
| test [edx + TCP_header.Flags], TH_ACK |
| jnz .respond_seg_ack |
| |
| test [edx + TCP_header.Flags], TH_SYN |
| jnz .respond_seg_syn |
| |
| .drop_no_socket: |
| |
| DEBUGF 1,"Drop (no socket)\n" |
| |
| call kernel_free |
| add esp, 4 |
| ret |
| |
| .respond_seg_ack: |
| |
| mov cl, TH_RST |
| call TCP_respond_segment |
| jmp .drop_no_socket |
| |
| .respond_seg_syn: |
| |
| mov cl, TH_RST + TH_ACK |
| call TCP_respond_segment |
| jmp .drop_no_socket |